package com.example.tests;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

import com.thoughtworks.xstream.XStream;

public class GroupDataGenerator {

	public static void main(String[] args) throws IOException {
		if (args.length < 3){
			System.out.println("Parameters <amount of test data> <file> <format>");
			return;
		}
		
		int amount = Integer.parseInt(args[0]);
		File file = new File(args[1]);
		String format = args[2];
		
		if (file.exists()) {
			System.out.println("File "+file+" exists.");
			return;
		}
		
		List<GroupData> groups = generateRandomGroups(amount);
		if ("csv".equals(format)) {
			saveGroupsToCSVFile (groups, file);
		} else if ("xml".equals(format)) {
			saveGroupsToXMLFile (groups, file);
		} else {
			System.out.println("Unkonown format" + format);
		}
	}

	private static void saveGroupsToXMLFile(List<GroupData> groups, File file) throws IOException {
		XStream xstream = new XStream();
		xstream.alias("group", GroupData.class);
		String xml = xstream.toXML(groups);
		FileWriter writer = new FileWriter(file);
		writer.write(xml);
		writer.close();
	}
	
	public static List<GroupData> loadGroupsFromXMLFile(File file) {
		XStream xstream = new XStream();
		xstream.alias("group", GroupData.class);
		return (List<GroupData>) xstream.fromXML(file);
	}


	private static void saveGroupsToCSVFile(List<GroupData> groups, File file) throws IOException {
		FileWriter writer = new FileWriter(file);
		
		for (GroupData group : groups) {
			writer.write(group.getName()+","+group.getHeader()+","+group.getFooter()+",!"+"\n");
		}
		
		writer.close();
	}
	
	public static List<GroupData> loadGroupsFromCSVFile(File file) throws IOException {
		List<GroupData> list = new ArrayList<GroupData>();
		FileReader reader = new FileReader(file);
		BufferedReader bufferedReader = new BufferedReader(reader);
		String line = bufferedReader.readLine();
		while (line != null) {
			String[] part = line.split(",");
			GroupData group = new GroupData()
				.withName(part[0])
				.withHeader(part[1])
				.withFooter(part[2]);
			list.add(group);
			line = bufferedReader.readLine();
		}
		bufferedReader.close();
		return list;
	}

	public static List<GroupData> generateRandomGroups(int amount) {
		List<GroupData> list = new ArrayList<GroupData>();
		for (int i = 0; i < amount; i++) {
			GroupData group = new GroupData()
				.withName(generateRandomString())
				.withHeader(generateRandomString())
				.withFooter(generateRandomString());
			
			list.add(group);

		}
		return list;
	}
	
	public static String generateRandomString() {
		Random rnd = new Random();
		if (rnd.nextInt(3) == 0) {
			return "";
		} else {
			return "test" + rnd.nextInt();
		}

	}

}
